United Airlines’ Bet on Supersonic Flight Faces Financial, Tech Hurdles (Youtube)

United Airlines' announcement that it plans to buy 15 supersonic aircraft from the startup Boom Supersonic is raising questions about the future of ultra-fast plane travel. In this video, WSJ speaks with an industry analyst to better understand what’s next for faster-than-sound air travel. Photo: Boom Supersonic (www.youtube.com) さらに...